People on this forum have disagreed on this. But I always use a Brownells barrel extension torque tool when installing or removing muzzle devices on an AR style gun.
http://www.brownells.com/gunsmith-to...prod27452.aspx
It's like a generic Geissele Reaction Rod. The Brownells tool is less than half the price, but is still a very high quality product.
I would suggest *not* using a upper receiver clamp/block to hold the barrel while you turn the muzzle device.
Joe Mamma
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